Due to uncertainties with its Tianjin facility lease and also to optimize the cost structure of the antenna product line and create flexibility in antenna manufacturing, the Company initiated a restructuring plan in 2019 to transition manufacturing from its Tianjin, China facility primarily to contract manufacturers in China. The Company completed the transition in the first quarter 2022. For the quarter ended March 31, 2022, the Company incurred restructuring expenses of $0.9 million, including $0.8 million for employee severance and benefits related to the separation of 69 employees and $0.1 million related to fixed assets and facilities. Severance costs were paid from the Company’s cash in its China bank accounts. With the transition complete, the Company vacated the Tianjin manufacturing facility in April 2022 and relocated a small team of employees associated with sourcing, quality, and local customer support at a new leased facility in Tianjin, China. See Note 11 for additional information on the Tianjin lease.

As a cost saving initiative, the Company separated 14 employees from its Beijing office in November 2021. The terminated positions were primarily related to antenna engineering in addition to sales support. The Company incurred restructuring expenses of $0.8 million consisting of employee severance and related employee benefits and for professional fees associated with employee separations. The Company engaged four former Beijing employees through a third-party employment agency to provide sales and engineering support. During the first quarter of 2022, the Company paid $0.4 million related to severance benefits accrued at December 31, 2021.

The following table summarizes the restructuring activity during the three months ended March 31, 2022 and the status of the reserves at March 31, 2022:

	Tianjin
	Manufacturing			Beijing			Total
Balance at December 31, 2021	$	0		$	368		$	368
Restructuring expense		935			0			935
Payments made		(935	)		(368	)		(1,303	)
Balance at March 31, 2022	$	0		$	0		$	0

The restructuring liability was recorded in accrued liabilities on the condensed consolidated balance sheet at December 31, 2021.

The Company allows its major distributors and certain other customers to return unused product under specified terms and conditions. The Company accrues for product returns based on historical sales and return trends. The refund liability related to estimated sales returns was $0.2 million at March 31, 2022 and December 31, 2021, and is included within accrued liabilities on the accompanying condensed consolidated balance sheets.

The Company offers repair and replacement warranties of up to five years for certain antenna products and test & measurement products. The Company’s warranty reserve is based on historical sales and costs of repair and replacement trends. The warranty reserve was $0.3 million at March 31, 2022 and 2021, respectively, and is included in accrued liabilities in the accompanying condensed consolidated balance sheets.

The following table summarizes the warranty activity during the three months ended March 31, 2022 and 2021:

	March 31,
	2022			2021
Beginning balance	$	257		$	285
Provisions for warranties		16			15
Consumption of reserves		(20	)		(5	)
Ending balance	$	253		$	295